my trans girlfriend and i use tranny with each other in a lighthearted manner and i wouldnt personally mind a close friend using the word in a similar tone but i get twitchy when its people i dont know as well when theyre using it as if its the proper nomenclature for trans people or obviously if theyre just outright using it as an insult that might just be a sign i spend too much time on transgendercirclejerk though but overall i consider it a slightly more touchy version of queer in terms of acceptability of use id obviously never refer to another trans person that way if i didnt know they were okay with it